Certified Rhythm Analysis Technician (CRAT) Practice Exam

Question: 1 / 400

Which wave is the first negative deflection found in the QRS complex?

Q wave

The first negative deflection in the QRS complex is indeed the Q wave. In the normal sequence of the QRS complex, which represents the electrical depolarization of the ventricles, the Q wave appears before the R wave and is characterized by its downward deflection.

In a typical ECG, the QRS complex starts with the Q wave, which is often small and can be absent in some leads, followed by the R wave, which is a tall upward deflection. The S wave follows the R wave and is another negative deflection, but it appears after the R wave. Thus, the Q wave is the initial component of the QRS complex and is essential for identifying the complex's structure and analyzing the heart's depolarization pattern effectively.

Understanding the order and characteristics of the waves in the QRS complex is crucial for accurately interpreting ECGs and diagnosing various cardiac conditions.

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R wave

S wave

T wave

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